DE2446401A1 - PRESELECTION DEVICE - Google Patents

Description

Patent attorney * 15.175 / 6 30 / ei

Dr. TW. nat. DIETER LOUfS ' '

Dipl.-Phys. CLAUS POHLAU Pipl-hig. FRANZ LOHRENTZ

35 * 00 NORNBERQ

AUTONNIC LHiITED, Tollesbury, Essex / England

Pre-selection device

The invention "relates to a preselection device which a frame, a viewfinder mounted on the frame, which has a first range of adjustable positions relative to the frame can be moved, setting means for moving the viewfinder to a desired position, a reference unit, for storage a set position of the viewfinder as well as an actuator which is used to either the reference unit for the purpose of storing the set position of the viewfinder or the viewfinder in a preselected one stored by the reference unit Position to - move.

A typical application for a presetter is in a push button tuner such as it is commonly used for car radios or televisions, is given. The viewfinder of the adjustment device is with connected to a tuning circuit of the tuner in such a way that the position of the viewfinder determines the frequency, and consequently the transmitter, to which the tuner is set is determined. Each push button includes a separate actuator to choose from of another transmitter and must first be "preset"

509844/0287

2A46401

to move the viewfinder to a position where the tuner is set to a desired station

The description mainly relates to a preselection device for push button-operated voting. But there are also other possible uses where one Preselection device may be useful, for example in the control of machine tools.

Because of the unfavorable conditions under which a car radio has to work due to driving, the intermediate frequency bandwidth is so limited that a tuning error of + 2 kHz results in a noticeable change in sensitivity. This is a reset error which is normally permissible in a standardized pressure test tuner because of the practical limits imposed by its precision mechanics. However, a reduction to + 1 kllz would be desirable. The width of the normal medium wave broadcast band is 1100 kHz, so that a tolerance of + 2 kHz represents a movement of the tuning core of 1/550. The total movement of the core to pass over the tape is usually 10 mm and can have a non-linearity of up to 30 % , so that in order to achieve a reset accuracy under the most unfavorable conditions, the adjustment again to the range of within + 0.013 mm, or with a adjustment accuracy of + 1 kHz must be set to 0.0065 mm.

5Q98U / 0287

The existing pre-selection devices have variable position stops which can be locked in a desired position on an actuating element (pushbutton). The position of a stop on an actuator acts as a reference memory which stores the desired position. When the actuator is operated, its stop captures the viewfinder, which is pretensioned so that it presses against it. In order to meet the accuracy requirements outlined above, such an arrangement must have an actuating element which covers a precisely defined path so that the stop, while it remains in the same position relative to the actuating element, also ensures that the viewfinder is moved relative to the Frame occupies the same position. This imposes strict tolerance restrictions on manufacturing - this is also unsatisfactory because, due to its construction, the actuator tends to turn out to be the part of the adjustment device which wears the most in operation. The tolerance and erosion problems have so far been overcome by allowing the actuators either very accurate and strong building (which is very expensive), or loss of accuracy accepts, _t so that a regular re-adjustment of an actuating element after a few operating programs necessary

609-'8-4 A / 02.8-7

The inventive preselection setting device has a frame, a viewfinder mounted on the frame, which over a first range of adjustable positions can be moved relative to the frame, adjustment means which the viewfinder move so that it can adjust to its position, one to store the viewfinder position also on the frame mounted reference unit, which can be moved relative to the frame over a second position range, its positions correspond to those of the first area, and an actuator which, according to a first mode of operation, for moving the Reference unit for the purpose of storing a set position of the viewfinder, and according to a second operating mode for moving the viewfinder can be operated so that the viewfinder moves and takes a preselected position of the reference unit.

The setting means can simply consist of a part of the viewfinder, which is expediently used as a handle by an operator who wants to set the position of the viewfinder. Alternatively, the adjustment means can comprise any link between an adjustment knob or handle and the viewfinder. In this case it may be desirable to provide a clutch mechanism to release the adjustment means when the actuator is switched on, or at least to release it when the actuator is used to move the viewfinder.

509844/0287

24464Q1

Determination of the operating modes of the actuation organ simply depends on whether or not the adjustment means is used to hold the viewfinder in position Adjustment means is solved and the viewfinder can move freely. In the first case, there is the first operating mode, at which is the reference unit for the purpose of storing the viewfinder position moves, in the second case the second operating mode results. The method of separating the two modes of operation relies on friction that holds the reference unit in place.

According to a preferred method for differentiating the two operating modes, the device has a clamp for fixing the position of the reference unit. In the first operating mode, the actuator is operated to release the clamp, before the reference unit is moved, then the reference unit is again when it has reached its position clamped. In the second mode of operation, the reference unit remains clamped and the viewfinder is moved. It is also possible to provide a clamp for the viewfinder to clamp it in place, when the reference unit is released.

The actuator may comprise a push button which causes a comparator to the viewfinder and the reference unit moves into corresponding positions when the button is pressed. The comparator is preferably on the actuator

609844/0287

mounted and is switched on every time the actuator is switched on, regardless of the operating mode.

The most important thing is that the reference unit (which is a puncture analogously to the more common stop), instead of being attached to the actuator on the frame. This will be allows relatively imprecise tolerances of the actuating member, since this only the reference unit and the viewfinder in corresponding Must bring positions, which can be done with a loosely attached comparator.

In a preferred exemplary embodiment according to the invention, the reference unit can be a pin made of high quality steel (For example, a roller suitable for a roller bearing). The viewfinder has a corresponding pen. To the To bring both parts into corresponding positions, their pins are aligned by a comparator, which consists of a Y-shaped nylon link, with bulging fork arms and a neck in which the pins have a sliding fit. When the actuator is turned on, the bulging forks grip the pins and lead them to the neck. Of the The comparator and a free end of the pins can move freely and so both pins and the neck come into one Position which is determined by the stationary of the two pins.

509844/0287

Preferably, when the presetter is used in conjunction with a tuner, the viewfinder acts directly on a variable tuning device to avoid technical tolerance problems in a link between the viewfinder and to avoid the tuning device.

Further features, details and advantages of the invention, which are presented here with a pushbutton operated tuner a radio is used, emerge from the following description of a preferred embodiment based on the drawing.

Show it:

FIG. 1 is an exploded perspective view of a voting device operated by pushbuttons; seen from the inside to the outside, which also represents the adjustment parts;

Figure 2 is an exploded view similar to Figure 1 showing the tuning parts; '"

FIG. 3 is a partially cut-away, perspective View showing the assembled adjustment parts; and

509844/0287

Figure 4 is a view similar to that in Figure 3 showing the represents assembled tuning parts

In the figure 1 is a front plate 10 of a lowering device shown for installation in a car. The front panel 10 has unit dimensions. Near its ends has the Front panel 10 has two round holes 12 and 14 for receiving a tuning or volume control button, it also has a Long hole 16, which in the middle part takes up most of the upper half and for the tuning display serves, five generally square holes 18, which are located under the elongated hole 16 and for pushing through Push buttons are used, and a rearwardly protruding shell 20 for attaching the adjustment mechanism. The front panel 10 further has various holes for fastening screws and slots for attaching one provided for the shell 20 Cover 22.

The shell 20 has two upright ends 24 and 26 adjacent to the outer pushbutton holes 18, so that all pushbuttons lie between the ends 24 and 26 of the shell 20. The tray 20 has a flat bottom 28 which extends over the rear half of its underside extends, and an elongated cutout 30, which extends the front half of its Underside stressed. The leading and trailing edges of the

509844/0287

The bottom 28 is bent upwards and the front edge 32 has five slots 38, which serve as guides for the pushbuttons, which also go through the holes 18. Through the Shell ends 24 and 26 are keyhole-like openings 34 and 36 butted, which for receiving a tuning rod 40 serve, which represents the viewfinder of the adjustment device and parallel to the front panel 10 freely to the left and can move to the right as it slides through openings 34 and 36. The tuning rod 40 has five upright ones Pins 42, the size of which is selected so that they pass through the slot parts of the keyhole-like openings 34 and 36 can go.

The shell cover 22 has two guide slots 51 and 52, which upwardly projecting tongues of the ends 24 and 26 receive. The cover 16, 22 goes over the end 24 of the shell and creates the basis for the tuning parts to be assembled. The part of the cover 22 which overlooks the shell 20 has five similar sets of slots and deformations; one record for each pushbutton. Each set includes a slot 53 which is arranged in alignment with its corresponding hole 18 for guiding a locking arm 60 is a holding pin 54 near the end of the slot 53, two impressions 55, which form an equilateral triangle with the holding hole 54 and a banana-shaped slot 56, wel-

509 8U / 02 87

has rather curved sides that are set in the middle of the retaining hole 54 are. The impressions 55 serve to adjust the angular position of a reference lock 62 on the upper part of the cover 22 while the retaining hole 54 and banana-shaped slot 56 are used in conjunction with a reference arm 57 which is rotatably attached to the holding hole 54 by means of a rivet 58, and which has a hook 59 which the lock engages, protrudes through the banana-shaped slot 56 and arches over the top of the cover 22. That The end of the reference arm 57, which can move freely in the banana-shaped slot 56, has a downwardly directed one Reference pin 44 (see FIG. 3) which is arranged in alignment with a pin 42 of the tuning rod 40.

Each push button includes a push rod 70, which two relatively wide, flat parts 71 and 72, which against each other are slightly offset, and comprises a relatively long, narrow, rearwardly projecting end 73, which against the rear Part 72 is more offset than the rear part 72 against the front part 71. The edges of the rear part 72 grasp, lower slots 74 in the sides of the generally square holes 18 and the rear end 73 passes through one of the guide holes 38. The rear end 73 is provided with a spiral pressure return spring 75 which, in the cutout 30 is and between the front end 32 of the bottom and the

B098U / 0287

Shoulder between the rear end 73 and the rear part 72 the push rod 70 acts to bias the push button forward.

A shift lever 80 can move freely on the floor 28, it has cam-shaped grooves 82, one of which catches the rear end 73 of a pushbutton whenever a button is pressed is operated and causes the shift lever 80 to move right or left. The shift lever 80 can be used to switch can be used between long and short wave.

The rear end of the rear, flat part 72 of the push rod 70 has inclined cam shoulders 76 for engaging a clutch actuator 121 around the tuning mechanism of the tuner from the tuning button when the push button is pressed. This is discussed below with With reference to Figures 2 and 4 described. The rear, flat part 72 also has a holder 77 in which a spacer 78, which carries a comparator 90, is attached. The comparator 90 is made of plastic material, for example Nylon or acetate, and includes a Y-shaped member with rearward-facing, bulged fork legs 91 and 92, which lead to a neck 93. The front end of the comparator 90 has beveled shoulders 94 which form the sides 64 of the holes 18 capture and prevent the push button

509844/0287

is pulled out through the front panel 10 of the tuner.

The front, flat part 71 of the push rod 70 has a longitudinally extending central slot 79 through which a push button-engaging pin 84 goes to secure a plastic button 85 to the push rod 70. the Push rod 70 is received in a lower slot 87 of button 85. A key lock 86 is also used by the pen 84 held in place and the assembly of button 85, pin 84 and lock 86 can freely move along the length of the slot 79 push the push rod 70. A longitudinally extending slot 61 of the locking arm 60, which of an upper Slot 88 of the key 85 is received, is also in engagement with the pin 84. This sliding key arrangement is well known in push button tuners and the arrangement is such that when button 85 is pulled forward, the Lock 86 detects the end of the push rod 70 and prevents that the button 85 on the push rod 70 returns before the push rod 70 hits a stop. Thereafter the lock 86 goes over the end of the push rod 70 upwards and returns to its normal position.

In the figure 2 tuning parts are in the same perspective shown as the adjustment parts in Figure 1. The figure represents the assembled parts. Three tuning coils

6098U / Q287

have movable cores 102 which are connected to a core slide

103 are connected. The core slide 103 has a bore

104 for receiving the tuning rod 40. Moving the tuning rod 40 laterally causes the cores 102 to move move in and out of their coils 101, thus changing the tuning of the tuner. The core slide has an upright flange 105 which is covered by a rack drive 106. The flange 105 and the frame 106 protrude upward through a slot 107 in the cover 22 of the tray 20. The coils 101 are on a one-to-one basis below protruding end 108 of the cover 22 mounted.

On the cover 22 is located next to the slot 107 a pivot 109 for a tuning drive wheel 110. The drive wheel 110 has a pinion 111 with a small diameter which engages in the frame 106 and a friction bevel gear 112 with a larger diameter to detect a bevel gear 115 on a tuning spindle 116, which is in the hole 12 of the Tuning button is held by a socket 117. The tuning spindle 116 goes through a coupling arm 120 in the Proximity of bevel gear 115, the arrangement being such that spindle bevel gear 115 is lifted off drive gear 112, when a push button is pressed so that the tuning spindle 116 does not tend to rotate when tuning is changed by pressing a push button. A clutch

50 9 844/0287

actuator 121 is near the front end of the faceplate 10 and is cammed to actuate the coupling arm 120 by means of the cam shoulders 76 of the push buttons.

The vote is indicated by a lever assembly 130 which has an upright position visible in the vote indicator hole 16 Pointer 131 and two pivot points 132 and 133 which rotate about pins 134 and 135 of the cover 22. The lever arrangement 130 is driven by a link connected to a pin 136 on the core slide 103. The cover 22 has a slot 137 through which the pin 136 protrudes.

Proceed as follows to preset a pushbutton for a desired station. First will the desired transmitter is set by rotating tuning spindle 116 to move cores 102 in their coils 101. See the relative diameters of bevel gear friction drives 112 and 115, drive bevel gear 112, and pinion 111 a considerable reduction in size for easier tuning. If a desired station is tuned in, is located the tuning rod 40 in the desired position, which by locking one of the reference pins 44 over one of the pins the tuning rod 40 is adjusted. Thus, the tuning spindle 116 and those connecting it to the tuning rod 40 provide

609844/0287

Share the setting means of the preselection setting device.

Although the reference arm 57 is rotatable about a rivet 58, it is normally in position by means of a reference lock 62 interposed between the hook 59 and the cover 22 stuck, fastened. The lock 62 is held in position by a bridge 66 of the lock arm 60. Around the reference arm To release 57, the button 85 is pulled forward and causes the pin 84 to slide into the slot 79 of the push rod 70 pushes and takes the locking arm 60 forward. The lock 62 is then free to move back and forth, so that its front end 65 goes up and its rear end releases the hook 59 of the reference arm 57. One tongue on front end 65 prevents complete detachment of the lock 62 from the bridge 66, while the impressions 55 in the cover 22 prevent the lock 62 from moving sideways. if the button 85 is pulled forward, it is replaced by a Lock 86 held in this position, but the lock remains free to slide relative to key 85. The shoulders of the comparator 90 form a stop against which the Button 85 on the push rod 70 is pulled.

Then the key 85 is pushed backwards. Does she move so first the cam shoulders 76 engage the clutch actuator 121 and cause the coupling arm

B 0 9 8 4 4/02 8 7

120 rotates and the spindle bevel gear 115 lifts off from the drive bevel gear 112. This process is in the set operating mode stepless, but prevents the spindle 116 from rotating according to a reset mode during operation. then detect the fork arms 91 and 92 of the comparator 90 the pin 42 of the Tuning rod and the pin 44 of the reference arm 57. Since the comparator 90 is free to rotate, it rotates so that the neck 93 assumes a position in which it encloses both pins in the position of the better locked pin, which in this case is the pin 42 of the tuning rod 40 is. The reference pin now has the same position in relation to the tuning pin and since both pins are made of exactly dimensionally stable Steel (there are roller bearings) are made and the comparator has an elastically tight neck 93, the setting is Sufficiently accurate for tuning in the medium wave range · Finally, the key lock 86 opens back upwards the push rod 70, whereby the button 85 can move back on the push rod 70 and thereby the locking type 60 resets its rearward position. This action clamps the reference arm 57 in position by means of the reference lock 62 a.

If the push button is released, the original transmitter can be set again by simply pressing the push button without the complications that arise

5098U / 0287

the pulling forward result. The locking arm 60 does not move with a normal push of the push button 85 and the Reference arm 57 remains locked. Subsequent depression of the push button again causes the comparator 90 to perform the two Pins in the position of the better locked pin for Brings alignment, which is now the locked reference pin 44. It is not necessary for the tuning rod 40 to provide a locking mechanism, since the friction has been found to be sufficient. But it should be one of those Mechanism may be required, it can be provided in a manner similar to the trigger for the tuning clutch and operated by any locking arm 60 which is in a forward (released) position.

It may prove advantageous to provide an arrangement in which the coupling is only as short as possible disengages, for example, only as long as the tuning rod actually from the comparator 90 during the reset process is moved. A first advantage of such an arrangement would result from the fact that less importance is attached to it must that the tuning rod 40 remains in its position due to the friction during the adjustment process, and a second The advantage would be that after the alignment of the viewfinder and the Reference unit, but before clamping the reference unit, a position of the push button would be given in which a

509844/0287

2 * 46401

Final tuning adjustment could be made in which the tuning knob is used to control both the viewfinder and the Move reference unit together. Of course, with such an arrangement, the clutch actuation mechanism is more complicated.

There is a definite advantage in having the comparator 90 match the reference pin 44 and pin 42 of the tuning rod 40 (the viewfinder). brings together, so that the dimensional stability of the comparator 90 is of little importance. However, matching is The reference unit and the viewfinder are not essential, and an apparatus can be designed in which the comparator is the reference unit and keeps viewfinders separated from each other by a predetermined distance.

Because of the small number of moving parts associated with pre-election voting, and because there is between the Tuning rod 40 and tuning elements 101 and 102 are no connecting links, can be used in the construction of the push button tuner achieve normal technical tolerances despite the accuracy requirements, and the mechanism be kept smaller than was possible up to now. This is advantageous because it is now in the standard opening for a car radio there is space for the transport mechanism a tape cassette or a tape cartridge and for

509844/0287

a push button tuner. In the embodiment described, the display is to be reduced in height, the tape cassettes are to be inserted through hole 16. There are embodiments with both a transport mechanism for tape cassettes as well as for tape cartridges for a car radio opening with the unit size 17.8 χ 5.08 era. For the smaller car radio opening with the unit size 17.8 χ 4.2 cm is currently only available in one embodiment with transport mechanism for a tape cassette.

509844/0287

Claims (12)

Patent (protection) claims: Preset setting device, which comprises a frame and a viewfinder mounted on the frame, which is relative to the frame via a first range of adjustable positions can be moved, adjustment means for moving the viewfinder into a desired position, a reference unit for storing a set position of the viewfinder and an actuator includes, which either serves the reference unit for the purpose of storing the set position of the viewfinder or the viewfinder to a preselected position stored by the reference unit, thereby characterized in that the reference unit (44) mounted on the frame (20, 22) and relative to the frame via a second range of positions which correspond to those of the first range, is movable. 2. Pre-selection device according to claim 1, characterized in that that for fixing the positions of the reference unit (44) - except when the actuating element (70) a clamp (59, 60, 62) is provided to move the reference unit (44). 509844/0287 3. Pre-selection device according to claim 1 or 2, characterized in that a comparator (90) is arranged is to bring the reference unit (44) and the viewfinder (40) into corresponding positions when the Actuator (70) is operated. 4. Pre-selection device according to claim 3, characterized in that the comparator (90) on the actuating member (70) is mounted. 5. Preselection setting device according to one of the preceding Claims, characterized in that the reference unit comprises a pin (44). 6. preselection setting device according to claim 5, characterized in that that the viewfinder (40) has a pin (42) which aligns with the pin (44) of the reference unit can be brought ... 7. preselection setting device according to claim 6, characterized in that the St if ft (44) of the reference unit / t and . the pin (42) of the viewfinder (40) made of absolutely dimensionally stable Steel consist .. '■ 3844/0 287 8. pre-rwahleinstellvorrichtung according to claim 6 or 7, characterized characterized in that the actuating member (70) has a comparator (90) with two fork arms bulging towards the front (91,92), which are arranged so that they grasp the pins (42, 44) and at the junction guide the two fork arms (91,92) into a neck (93) that brings them into alignment. 9. preselection setting device according to claim 8, characterized in that that the comparator (90) is made of plastic. 10. Pre-selection device according to one of the preceding claims, characterized in that the actuating member (70) is a set of pushbuttons, which is located in can move at right angles to the direction of movement of the viewfinder (40). 11. Pre-selection device according to one of the preceding Claims, characterized in that the reference unit (44) is mounted on an arm (57) which is rotatable about a fixed point (54) of the frame (20, 22), wherein the arc of movement of the reference unit (44) runs essentially parallel to the movement range of the viewfinder (40). 509844/0 287 24A6401 12. Pre-selection device according to one of the preceding claims, characterized in that it is in a combination from pushbutton-operated car radio tuner and tape player is built in, with sufficient space for a tape container is present, which is in the tape recorder through an opening (16) between the "pushbuttons (85) and the edge of a hole with standard dimensions, which in cars is intended for a radio, can be introduced. B09844 / 0287